Centre for the Mathematics of Planet Earth

MS34 Transfer Operator Methods for Open and Nonautonomous Systems with Applications
2021-05-23 12:15 - 14:15 (Europe/London)
Nonlinear dynamical systems often exhibit essentially random temporal behavior. It then makes more sense to analyse the statistical long term properties of solution ensembles, rather than individual solutions. A powerful tool in this analysis is the transfer operator, which represents the pushforward of densities (wrt some standard volume), as the spectral properties of the transfer operator directly relate to statistical properties of the dynamics. This approach was first developed for autonomous systems on compact state spaces.
In this minisymposium, we will consider open systems (where trajectories may escape), as well as random systems (resulting in a random transfer operators). Studying the transfer operators again allows conclusions on the long term statistical properties of the dynamics. For open systems for instance one finds conditionally invariant probabilities while random transfer operators can be used to study pullback invariant measures.
S. Vaienti will give an overview over transfer operator methods in open systems, while P. Giulietti will talk about statistical extremes for open systems. The work by L. Oljaca uses (Hilbert) projective metrics on cones to analyse random transfer operators which arise in nonlinear filtering (motivated by Data Assimilation techniques in Weather, Climate, and Oceans). K. Padberg-Gehle will present an application to coherent structures in fluid flows.
Organizer: Jochen Broecker, University of Reading, United Kingdom
Tobias Kuna, University of Reading, United Kingdom

12:15-12:40 Thermodynamic Formalism for Random Covering Systems abstract
Sandro Vaienti, Aix-Marseille University and Universite de Toulon, France; Jason Atnip and Gary Froyland, University of New South Wales, Australia; Cecilia Gonzalez-Tokman, University of Queensland, Australia

12:45-1:10 Extreme Value Theory via Transfer Operators abstract
Paolo Giulietti, Università di Pisa, Italy

1:15-1:40 Stability of the Nonlinear Filter for Anosov Diffeomorphisms abstract
Lea Oljaca, University of Exeter, United Kingdom; Jochen Broecker and Tobias Kuna, University of Reading, United Kingdom

1:45-2:10 Applications of Transfer Operator Methods in Fluid Dynamics abstract
Kathrin Padberg-Gehle, Leuphana University Lueneburg, Germany

For more information please visit the event page.
This minsymposium is part of the SIAM Conference on Applications of Dynamical Systems (DS21), May 23 – 27, 2021, Virtual Conference.

University of Reading SIAM-IMA Student Chapter Conference 2021
2021-06-07 - 2021-06-09
Join us at the University of Reading SIAM-IMA Student Chapter Conference, Monday 7th June – Wednesday 9th June

Keynote speakers
Prof. Francoise Tisseur, University of Manchester
“What are nonlinear eigenvalue problems and how to solve them?”
Dr. Naratip Santitissadeekorn, University of Surrey
“Uncertainty quantification for time-series of count data and influence network reconstruction”
Prof. Jan Sieber, University of Exeter
“Equations describing delay effects, and their applications in climate science”

For more information please visit the SIAM-IMA Student Chapter website
To join the online conference, please sign up here

Dynamical Landscape and Multistability of a Climate Model: Inaugural seminar, Mathematics of Planet Earth research group, Imperial College London
2021-06-08 16:00 - 17:00
Professor Valerio Lucarini (Mathematics) will deliver the inaugural online seminar of the Mathematics of Planet Earth research group in the Department of Mathematics at Imperial College London on Tuesday 8 June 2021 from 16.00 – 17.00. The seminar is titled ‘Dynamical Landscape and Multistability of a Climate Model’.
The event is free and open to all. Tickets are available on a first come first served basis from http://www.imperial.ac.uk/events/135280/inaugural-seminar/

Nonautonomous dynamical systems: from theory to applications
2021-07-05 10:30 - 17:30
This event will take place on 5th July 2021 at the University of Exeter (Streatham Campus) in Exeter, with further opportunities to participate in informal discussions on 6th and 7th July.
This workshop is organised by Peter Ashwin (Exeter) and Lea Oljaca (Exeter) under the EPSRC funded project “Applied Nonautonomous Dynamical Systems: Theory, Methods and Examples” and together with principal researchers Martin Rasmussen (Imperial) and Valerio Lucarini (Reading) and project partners Richard Wood (Met office), TiPES and S Wieczorek (Cork).
For further details, please click here.
Please register here by 30th June 2021. There is no registration fee.

LMS Undergraduate Summer Schools
2021-07-11 - 2021-07-23
2021 LMS Undergraduate Summer School
University of Swansea, 11-23 July 2021
Dr Tobias Kuna, Associate Professor, Department of Mathematics & Statistics will be one of the course lecturers at the 2021 LMS Undergraduate Summer School.
For further details please visit https://www.swansea.ac.uk/maths/seminars/lms-summer-school-2020/

ICMS Advanced Workshop - Mathematics for the Climate Crisis: Extremes and Tipping Points
2021-11-01 - 2021-11-05 | ICMS, Edinburgh
Advanced Workshop “Mathematics for the Climate Crisis: Extremes and Tipping Points”
November 1st – 5th 2021
ICMS, Edinburgh, UK
Between November 1-12 2021, Glasgow will host the UNFCCC COP26, which will take place under the presidency of the UK. This will indeed be the most important event dealing with multilateral negotiation on climate policy for 2021, and it is expected (and hoped) that important measures will be taken to deal with the ongoing climate crisis and make sure that we stay within the so-called safe operating space for our planet.
This workshop will explore the mathematical bases of the climate crisis, underlying the properties of tipping points, extreme events, and making an assessment of what is known and not known about the current and future risks associated with erratic changes in the climate. The timing of the event is a rare opportunity of being able to match scientific novelty and timeliness of a topic that is rapidly gaining interest and ground, with the spotlight coming from the presence of a global event taking place in Scotland. There will be a wide range of seminars and lectures from leading academics from the UK, Europe and the US.
So many advanced research and training schools in the last year have either not taken place at all or have taken place in severely limited form. In recognition of current needs among UK and international graduate students and early career researchers, we are planning for this Workshop to be in-person for participants. The workshop includes opportunities for discussion among younger scientists about different aspects of the mathematics and science of the climate crisis, as well discussion of its impact on political decision-making.
The workshop will include a poster session, interactive activities and social events. It is suitable for early career researchers and PhD students with some background in mathematical modelling.
Speakers include:
Peter Ashwin, University of Exeter
Niklas Boers, FU Berlin/PIK-Potsdam, University of Exeter
Chris Budd, University of Bath
Alberto Carrassi, University of Reading/NCEO
Rosalind Cornforth, University of Reading
Davide Faranda, CEA/CNRS
Ulrike Feudel, University of Oldenburg
Vera M. Galfi, University of Uppsala
Michael Ghil, ENS and University of California, Los Angeles
Anna von der Heydt, University of Utrecht
Valerio Lucarini, University of Reading
Peter Cox, University of Exeter
Peter Ditlevsen, University of Copenhagen
Additionally, Chris Budd will lead a public engagement event.
Arrangements
If you would like to participate in this event, including the opportunity to present a poster please register your interest here: https://www.smartsurvey.co.uk/s/MCC2021/. The closing date for applications will be 27 September 2021.
Because of the rapidly changing situation with Covid, we aim to confirm the workshop as in-person (or not) only early in October. You should not to make travel or accommodation plans until you hear this confirmation.
https://www.icms.org.uk/events/workshops/MCC2021
Organisers
Peter Ashwin, University of Exeter
Ulrike Feudel, University of Oldenburg
Anna von der Heydt University of Utrecht
Valerio Lucarini, University of Reading

Isaac Newton Institute Satellite Programme: Geophysical fluid dynamics; from mathematical theory to operational prediction
2022-08-30 08:00 - 2022-09-23 17:00
This programme was the inaugural ‘INI@’ Satellite Programme, and took place at the University of Reading.
A better understanding of the climate system is of great societal relevance, due to the importance of reliable environmental forecasts and the looming climate crisis. Recent scientific progress ranges from improving operational forecasting systems to abstract results on infinite dynamical systems. it is of vital importance to bring theses insights together in a proper interdisciplinary environment, which this programme aims to provide. With a focus on the fluid dynamical components of the climate system, practitioners will learn from mathematicians and statisticians about new tools and techniques to analyse these, while at the same time interesting new challenges for the mathematical community will emerge. The programme will address questions relating to geophysical fluid dynamics and forecasting, such as qualitative and statistical behaviour of geophysical models, response to deterministic and stochastic perturbations, sources of predictability at different spatial and temporal scales, forecast verification, and data assimilation. We will be taking both mathematical and statistical perspectives as well as applied and operational perspectives at the same time.

Organisers

Jochen Bröcker University of Reading
Giulia Carigi University of L’Aquila; University of Reading
Tobias Kuna University of Reading; University of L’Aquila
Valerio Lucarini University of Reading
Lea Oljaca University of Exeter
Jeroen Wouters Technische Universität Hamburg-Harburg

Visit of Jana de Wiljes, Univ. Illmenau
2025-04-02 08:00 - 17:00
Our next CMPE visitor will be
Jana de Wiljes, University of Ilmenau, Germany
Visit dates: Monday, 19th of May to Friday, 23rd of May.
On Wednesday, 21st of May, Jana will speak to the students of the MFC CDT as part of the MFC Wednesday. Furthermore, Jana will give a
Seminar on Thursday, 22nd of May at 2pm, location TBC.
